Driving apparatus of a multi-head type embroidery machine

ABSTRACT

A driving apparatus of a multi-head type embroidery machine prevents the twist of an upper shaft by transmitting the rotation force of a driving motor to a central portion of the upper shaft which drives heads. The driving apparatus includes a driving pulley coupled to a driving shaft of the driving motor, a driven pulley installed on the central portion of the upper shaft, and a power transmitting member for the driving pulley to the driven pulley and transmitting the rotation force of the driving motor to the upper shaft. The driving motor is received in a bracket which is fixed to a mounting recess formed on the beam. Between the bracket and the mounting recess, a vibration proofing member is inserted so that the noise and vibration are prevented. Nearby the driven pulley, an oscillation prevention unit for preventing oscillation of the upper shaft is installed. Due to the oscillation preventing unit, the upper shaft may be not oscillated in upward and downward direction and right-hand and left-had direction so that is uniformly rotated.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a driving apparatus of a multi-head type embroidery machine, and more particularly, to a driving apparatus of a multi-head type embroidery machine for preventing twist of a upper shaft due to power transmitted from a driving motor and noise and vibration of the driving motor.

[0003] 2. Prior Art

[0004]FIG. 1 shows a multi-head type embroidery machine according to a prior art. As shown in FIG. 1, the multi-head type embroidery machine of the prior art includes a working table 100, a beam which is installed through both side ends of the working table 100, a plurality of heads 104, installed on the beam 102 by regular interval, having a plurality of needles.

[0005] An upper shaft 106 driving a thread take-up cam (not shown) is transversely installed to pass through the heads 104, an a lower shaft 108 rotating a plurality of shuttles (not shown) is installed at lower portion of the working table 100. A driving motor 110 is installed a lower end portion of the working table 100 so that the rotating force of the driving motor 1 10 is transmitted to respective ends of the upper shaft 106 and the lower shaft 108. By doing so, the needles and the shuttles are driven to perform the embroidery.

[0006] However, according to the embroidery machine of the prior art, the power of the driving motor 110 is transmitted from the respective ends of the upper shaft 106 and the lower shaft 108 to respective another ends thereof. The degree of twist of the upper shaft 106 driving the thread take-up cam becomes larger from the end thereof toward the other end, so that embroidery is deformed when the embroidery is performed.

SUMMARY OF THE INVENTION

[0007] Therefore, the present invention is made to solve such a problem, it is an object of the invention to provide a driving apparatus of a multi-head type embroidery machine for preventing twist of an upper shaft during transmitting the rotating force of a driving motor.

[0008] It is another object of the present invention to provide a driving apparatus of a multihead type embroidery machine for preventing noise and vibration from the driving motor when the driving motor is driven.

[0009] In order to accomplish the object, the present invention provides a driving apparatus of a multi-head type embroidery machine which includes comprising a driving motor for generating rotating force and having a driving shaft, a working table, a beam installed on the working table, a plurality of head, installed by regular interval on the beam, having a plurality of needles and a plurality of thread take-up cams, an upper shaft driven by the rotating force for rotating the thread take-up cams, and a driving apparatus for transmitting the rotating force of the driving motor to the upper shaft, the driving apparatus is installed on a central portion of a beam and a central portion of an upper shaft and transmits rotating force of a driving motor to the central portion of the upper shaft.

[0010] According the aspect of the present invention, the driving motor is installed on the central portion of the beam, the driving apparatus includes a driving pulley coupled to the driving shaft, a driven pulley installed on the central portion of the upper shaft, and a power transmitting member for connecting the driving pulley to the driven pulley and transmitting the rotating force of the driving motor to the driven pulley.

[0011] According to other aspect of the present invention, a motor mounting recess is formed on the central portion of the beam, a plurality of supporting plates are installed on the motor mounting recess, the driving apparatus of the present invention further includes a bracket fixed on the plurality of supporting plates from receiving the driving motor and a cover installed above the driving motor for preventing the noise of the driving motor.

[0012] The bracket includes a plurality of ribs formed at outer peripheral of the bracket for fixing the bracket to the supporting plates, and a vibration proofing member inserted between the bracket and the motor mounting recess for preventing noise and vibration of the driving motor.

[0013] According to the feature of the present invention, a timing belt is used as the power transmitting member.

[0014] According to the feature of the present invention, an oscillation preventing unit installed nearby the driven pulley on the upper shaft, for preventing oscillation of the upper shaft. The oscillation preventing unit an upper shaft bracket installed on the beam, a bearing installed on the upper shaft bracket for rotatably support the upper shaft, and an upper shaft holder for preventing the oscillation of the upper shaft.

[0015] According to the present invention, the power of the driving motor is transmitted to the central portion of the upper shaft so that the twist of the upper shaft is prevented and the oscillation of the upper shaft is prevented by the oscillation preventing unit. Moreover, installing the cover and vibration proofing member, the noise and vibration generated from the driving motor is effectively prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings, in which like components are referred to by like reference numerals. In the drawings:

[0017]FIG. 1 is a front view showing a multi-head type embroidery machine according to the prior art;

[0018]FIG. 2 is a front view showing a multi-head type embroidery machine which a driving apparatus according to the preferred embodiment of the present invention is applied;

[0019]FIG. 3 is a side cross-sectional view showing the driving apparatus of a multi-head type embroidery machine of FIG. 2; and

[0020]FIG. 4 is an exploded perspective view showing the driving apparatus of a multi-head type embroidery machine according to the present invention shown in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0021]FIG. 2 shows a driving apparatus of a multi-head type embroidery machine according to the preferred embodiment of the present invention. The multi-head type embroidery machine, which the driving apparatus of the preferred embodiment is applied, includes a rectangular working table 2, a beam 4 installed to be reach from an upper end to the other upper end of the working table 2, a plurality of heads 6, installed by regular interval, having a plurality of needles and thread take-up cams (not shown), a driving motor with a driving shaft 24 generating rotating force, and an upper shaft 8, installed to pass through the heads 6, rotating the thread take-up cams.

[0022] The upper shaft 8 is rotatably installed on the beam 4 by passing through the head 6 in horizontal direction. An end of the upper shaft 8 is installed with a first pulley 10. At a lower side of the working table 2, a lower shaft 14 is rotatably installed at a corresponding position to the head 6 to rotate a shuttle (not shown) of an embroidery bed 12. The lower shaft 14 is horizontally installed and provide with a second pulley 16 at an end thereof. The lower shaft 14 is driven by a rotation transmitting means 18 such as a belt for connecting the first pulley 10 to the second pulley 16.

[0023] The driving apparatus according to the preferred embodiment of the present invention, as shown in FIG. 2, is installed at upper central portion of the beam 4 and the central portion of the upper shaft 8. The driving apparatus of the preferred embodiment of the present invention, as FIGS. 3 and 4, includes a driving motor installed on the upper central portion of the beam 4 and having a driving shaft 24, a driving pulley 25 coupled to the driving shaft 24, a driven pulley 38 installed on a central portion of the upper shaft 8, and a power transmitting member 40 connecting the driving pulley 25 to the driven pulley 38 and transmitting the rotating force of the driving motor 26 to the driven pulley 38.

[0024] The beam 4 is formed with a motor mounting recess 20. A plurality of supporting plates 32 are installed on upper portions of the motor mounting recess 20. On the plurality of the supporting plates 32, a bracket 28 is fixed. The bracket 28 has a plurality of supporting ribs 3 1, formed at outer peripheral of the bracket 28, for fixing the bracket 28 on the beam 4. Vibration proofing members, which prevent noise and vibration due to the operation of the driving motor 26, are inserted between the plurality of the supporting ribs 31 and the supporting plates 32. The bracket 28 is fixed on the supporting plates 32 by a fastening means such as a bolt. The driving motor 26 has a motor mounting plate 27 which is attached to a front side of the driving motor 26. The motor mounting plate 27 is fixed to the bracket 28 by a screw. The driving motor 26 is installed in the mounting recess 28 in the state that the driving motor 26 is received and mounted in the bracket 28 by fixing the motor mounting plate 27 on a front side of the bracket 28. On an upper side of the driving motor 26, a cover 30 is installed to prevent noise generated from the driving motor 2 during the operation of the driving motor 26. The driving motor is controlled by a control section 22.

[0025] The driving pulley 25 is installed on the driving shaft 24 of the driving motor 25 by a screw. The driven pulley 38 is installed on the central portion of the upper shaft 8 by a screw. In order to fixing the driven pulley 38 on the upper shaft 8, the central portion of the upper shaft 8 is cut off. By doing so, the rotating force of the driving motor 26 is transmitted to the upper shaft 8 without sliding. In this embodiment, a timing belt is used as a power transmitting member 40 so that the rotating force of the driving motor 26 is firmly transmitted to the upper shaft 8.

[0026] A oscillating prevention section for preventing oscillation in upward and downward directions and right-hand and left hand direction and rotatably supporting the upper shaft 8 is installed on the upper shaft 8 nearby where the driven pulley 38 is installed. The oscillating preventing section includes an upper shaft bracket 9 installed on the beam 4 and a bearing 11 which is mounted in the upper shaft bracket 9 and rotatably supports the upper shaft 8. The oscillating prevention section further includes an upper shaft holder 13 so as to firmly prevent the oscillation of the upper shaft 8. The upper shaft holder 13 is installed on the upper shaft bracket 9 so that the upper shaft 8 penetrates the upper shaft holder 13.

[0027] When the driving motor 26 is driven by the control section 22, the driving shaft 24 and the driving pulley 25 are rotated. The rotating force of the driving motor 26 is transmitted to the central portion of the upper shaft 8 via the driving pulley 25, the power transmitting member 40, and the driven pulley 38. When the upper shaft 8 is rotated, the upper shaft 8 is prevented from the upward and downward and fight-hand and left-hand oscillation by the oscillation preventing section, and is prevented from the twist by transmitting the rotating force of the driving motor 26 to the central portion of the upper shaft 8.

[0028] The rotating force of the driving motor 26 transmitted to the upper shaft 8 is transmitted to the lower shaft 14 via the first pulley 10 installed at the end of the upper shaft 8, the rotation transmitting means 18, and the second pulley 16. When the upper and lower shafts 8 and 14 are driven, the thread take-up cams of the heads 6 and the shuttles of the bed 12 are driven so that the embroidery is performed on the working table 2.

[0029] During the operation of the multi-head type embroidery machine, the noise and vibration due to the driving motor 26 is prevented by the cover 30 and the vibration proofing member, and the oscillation of the upper shaft 8 is prevented by the oscillation preventing section so that quiet embroidery may be performed on the working table 2.

[0030] As described with the preferred embodiment of the present invention, according to the driving apparatus of a multi-head type embroidery machine, by transmitting the rotating force of the driving motor to the central portion of the upper shaft, the twist of the upper shaft may be prevented, the upper shaft may be uniformly rotated so that the embroidery is uniformly performed. The noise and vibration from the driving motor are prevented by the vibration proofing member and the cover.

[0031] The present invention has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 

What is claimed is:
 1. In a multi-head type embroidery machine comprising a driving motor for generating rotating force and having a driving shaft, a working table, a beam installed on the working table, a plurality of head, installed by regular interval on the beam, having a plurality of needles and a plurality of thread take-up cams, an upper shaft driven by the rotating force for rotating the thread take-up cams, and a driving apparatus for transmitting the rotating force of the driving motor to the upper shaft, characterized in that the driving apparatus is installed on a central portion of the beam and a central portion of the upper shaft and transmits the rotating force of the driving motor to the central portion of the upper shaft.
 2. The driving apparatus as claimed in claim 1, wherein the driving motor is installed on the central portion of the beam, the driving apparatus comprising: a driving pulley coupled to the driving shaft; a driven pulley installed on the central portion of the upper shaft; and a power transmitting member for connecting the driving pulley to the driven pulley and transmitting the rotating force of the driving motor to the driven pulley.
 3. The driving apparatus as claimed in claim 2, wherein a motor mounting recess is formed on the central portion of the beam, a plurality of supporting plates are installed on the motor mounting recess, further comprising: a bracket fixed on the plurality of supporting plates from receiving the driving motor.
 4. The driving apparatus as claimed in claim 3, further comprising: a vibration proofing member inserted between the bracket and the motor mounting recess for preventing noise and vibration of the driving motor.
 5. The driving apparatus as claimed in claim 3, wherein the vibration proofing member comprises a rubber.
 6. The driving apparatus as claimed in claim 4, further comprising: a cover installed above the driving motor for preventing the noise of the driving motor.
 7. The driving apparatus as claimed in claim 3, wherein the bracket includes a plurality of ribs formed at outer peripheral of the bracket for fixing the bracket to the supporting plates, and a vibration proofing member for preventing noise and vibration of the driving motor is inserted between the plurality of supporting ribs of the bracket and the supporting plates.
 8. The driving apparatus as claimed in claim 7, wherein the vibration proofing member comprises a rubber.
 9. The driving apparatus as claimed in claim 2, wherein the power transmitting member comprises a timing belt.
 10. The driving apparatus as claimed in claim 2, further comprising: an oscillation preventing means, installed nearby the driven pulley on the upper shaft, for preventing oscillation of the upper shaft.
 11. The driving apparatus as claimed in claim 10, wherein the oscillation preventing means comprises: an upper shaft bracket installed on the beam; and a bearing installed on the upper shaft bracket for rotatably support the upper shaft.
 12. The driving apparatus as claimed in claim 11, wherein the oscillation prevention means further comprises: an upper shaft holder for preventing the oscillation of the upper shaft. 